Improvement in printing-telegraphs



T. A. EDISON.

Printing-Telegraph.

'No. 168,004. Patented$ept. 21,1875.

MPETERS, PHOTO-LITHOGRAFHER, WASHINGTON. D C.

LINrrED STTES PATENT OFFICE,

THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE GOLD AND STOCKTELEGRAPH COMPANY, OF NEW YORK, N. Y.

IMPROVEMENT IN PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent N 0. 168,004, datedSeptember 21 1875; application filed June 1, 1874.

To all whom it may concern:

Be it known that I, THOMAS A. EDISON, of Newark, in the county of Essexand State of New Jersey, have invented an Improvement inPrinting-Telegraphs, of which the following is a specification Twoelectro magnets operating upon an armature have been used, and themagnets have been charged with pulsations of alternate oppositepolarity, anal the armature has acted to move the typeavhml.

My present invention relates to this class of print-ing-telegraphs; andconsists in an arran gementof armatures, electro-magn'ets, typewheel,and printing-lever, so that the printing is efi'ected by the samemagnets that set the type-wheel when a pause occurs in transmittingcurrents of alternate opposite polarity.

In the drawing I have represented, by an elevation, the instrument asarranged by me.

The electro-magnets a b are in the main-line circuits that connect withthe binding-screws c d, and between the cores of these magnets is thearmature c, that is by preference made double, and upon opposite sidesof the lever fthat has its fulcrum at g, and is provided withwedge-acting pallets i 2', operating upon the ratchet-wheel l, shaft n,and type-wheel m to rotate the same. The cores of the electromagnets areextended laterally, as at s s, and an armature ,t, is provided upontheleveru, that is connected with the printing-lever o. The pulsationssent over the line are of alternate opposite polarity, so that thearmature 0 will be repelled from the magnet, with which it is incontact, as the current of opposite polarity enters the helix, and thearmature and lever by their momentum (from repulsion) are thrown towardthe opposite magnet, and the armature is attracted thereby. In thismanner the type-wheel pallets will be moved with as great rapidity asthe pulsations of alternatin g polarity can be sent. The armature t,however, will not be attracted because the magnetic energy of onepolarity does not accumulate sufficiently before the pulsation ofopposite polarity is introduced; but when a slight pause occurs on aclosed circuit the armature t is attracted, and the printing-lever ismoved, and the impression made by the pad w, pressing the paper towardthe type wheel.

The mechanism for moving the paper forms no part of my invention, andmay be of any desired character.

I claim as my invention- 1. Two electro-magnets in the electric circuit,with an armature moved between their cores in consequence of reversingthe polarity of the pulsations, such armature actuating the lever andtype-wheel, in combination with the lateral cores of the electro-magnetand the armature that operates the printing-lever, as set forth.

2. The arrangement of the type-wheel lever and armaturev between twoelectro-magnets,

and an armature and lever at one side of the type-wheel, operating animpression-pad at the opposite side of the type-wheel, substantially asset forth. I

Signed by me this 22d day of May, A. D. 874.

THOS. A. EDISON.

Witnesses GEO. T. PINcKNEY, CHAS. H. SMITH.

